problem with PASS AM.

[xr000]

THE RED SQUARE,two figure are printed wrong,
at the begging ,the am worked well,
and after a long time ,the am didn't work.
and when i put two conponent in correct position,but,the IRFP 240 current get very big,5A,
why did this happen?

 

[xr000]

sch.

sch.

 

[GRollins]

Aleph-M?
Seems to me that circuit once had another name....oh well, you can't have everything.
If you're getting 5A, chances are good that the voltage across the 390 Ohm load to the front end is too high. That would drive the output MOSFET (the one on the bottom) into some pretty serious conduction.
You'll need to check the rest of the components. It wouldn't surprise me if one of the front end MOSFETs is roasted.

Grey

 

[lumanauw]

Hi, Xr000,

You buy the PCB from where? Is Mr. Nelson Pass know about this? He's the owner of all Aleph design.

 

[xr000]

thanks GRollins

I get the SCH from web.
and the board were produced myself!.

 

[GRollins]

If you get curious about the history of that design, you might look up a thread here called "The Mini-A"

Grey

 

[xr000]

ok,he he ,thank you again.

 

[xr000]

ok,he he ,thank you again.

 

[xr000]

 

[China_Vincent]

Very beautiful!
Support!!!!

 

[Blues]

xr000,

You just reminded me how I suck with chopsticks!

 

[lumanauw]

Hi, xr000,

China has over 1,000,000,000 people. How's the DIY audio world there? Must be very interesting, China is full with bright people, it is the 3rd country that can send man to space.

 

[xr000]

Hi, xr000,

China has over 1,000,000,000 people. How's the DIY audio world there? Must be very interesting, China is full with bright people, it is the 3rd country that can send man to space.

in china ,and also many people like DIY audio.
thank you give a high praise to us.
and if you have chance come china,you are wellcome.!